MkDocs (http://mkdocs.org http://mkdocs.org) or Sphinx (https://github.com/sphinx-doc/sphinx https://github.com/sphinx-doc/sphinx) along with ReadTheDocs (https

MkDocs (http://mkdocs.org http://mkdocs.org) or Sphinx (https://github.com/sphinx-doc/sphinx https://github.com/sphinx-doc/sphinx) along with ReadTheDocs (https://readthedocs.org https://readthedocs.org). I've also used Confluence and a few other tools. These are my preferences though. What are you looking to accomplish?